Date.prototype.format = function(format) { 
	
	var o = { 
		"M+" : this.getMonth() + 1,  
    	"d+" : this.getDate(),  
    	"h+" : this.getHours(),  
    	"m+" : this.getMinutes(),  
    	"s+" : this.getSeconds(),  
    	"q+" : Math.floor((this.getMonth() + 3) / 3),  
    	"S" : this.getMilliseconds()
    } 

    if(/(y+)/.test(format)) { 
    	format = format.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); 
    } 

    for(var k in o) { 
    	if(new RegExp("("+ k +")").test(format)) { 
    		format = format.replace(RegExp.$1, RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length)); 
    	} 
    } 
    		
    return format; 
    
} 